/**
 * 原始数据类型
 */

 const a: string = 'foobar'

 const b: number = 100 // Nan Infinity

 const c: boolean = true // false

//  const d: string = null

 const e: void = undefined

 const f: null = null
 
 const g: undefined = undefined

 const h: symbol = Symbol()

// const error: string = 100